Buffett's top positions in Berkshire Hathaway's portfolio include Apple, American Express, and Bank of America.

Buffett, 94, announced last month he will step down as Berkshire Hathaway’s CEO by the end of 2025. The investment mogul has tapped Berkshire Hathaway Energy CEO Greg Abel as his replacement.

Warren Buffett is acclaimed for his financial savvy—and his success as a self-made billionaire. Those wishing to emulate the 94-year-old businessman, investor, and philanthropist should pay ...